Texas Instruments TI-80 User Manual - Page 87
Exploring a Graph with TRACE, of the function. However, the coordinate values at the bottom
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Exploring a Graph with TRACE TRACE moves the cursor from one plotted point to the next along a function. The cursor coordinates are displayed at the bottom of the screen. Beginning a Trace Moving along a Function Press + to begin a trace. If the graph is not displayed already, the TI-80 displays it. The cursor is on the first selected function in the Y= list at the middle X value on the screen. The number of the function appears at the upper right of the display. Note: If any STAT PLOTS are turned on, the TI-80 attempts to trace the first stat plot. Press 9 and 6 to move the cursor along the function. Each press moves the cursor from one plotted point to the next. Press 2 9 and 2 6 to move the cursor five plotted points at a time. Tracing updates and displays the values of the variables X and Y. The Y value is calculated from the X value; that is, Y=Yn(X). If the function is undefined at an X value, the Y value is blank. ) Trace cursor on the curve. Panning to the Left or Right QuickZoom If the Y value of a function is above or below the viewing window, the cursor disappears as you move it to that portion of the function. However, the coordinate values at the bottom of the screen indicate the cursor coordinates. If you trace a function off the left or right edge of the screen, the viewing window automatically pans to the right or left. XMIN and XMAX are updated to correspond to the new viewing window. Note: The screen does not pan if a STAT PLOT is on. While tracing, you can press ¸ to adjust the viewing window so that the cursor location becomes the center of a new viewing window, even if the cursor is above or below the display. This allows "panning" up and down. After QuickZoom, TRACE is still active. Function Graphing 4-13